Abstract: The present invention provides, among other things, a heat exchanger including a plurality of tubes providing a flow path for a first fluid, a fin supported between two of the plurality of tubes and positioned along a flow path for a second fluid. Together, the fin and the plurality of tubes at least partially define a heat exchanger core. The heat exchanger can also include first and second tanks positioned adjacent to opposite ends of the plurality of tubes and an elastically deformable side part extending across the heat exchanger core and including a pair of integrally formed caps for closing openings in the first and second tanks.